TB42 Auto box Electricals?

[ripper]

Okay, well I got a lot more net time than I expected today, so I've written my auto story and read yours.

Ok I did the self diagnosis this morning (5 times and once just then at lunch) it says the problem is: inhibitor switch, power shift switch, kickdown switch or idle switch circuit is disconnected or the control unit is damaged.
Anyone got any clues as to which it might be? Or which is the easiest to check? Haynes Book has info about inhibitor switch and power switch only.

Lucas

So your power light stays on after you change gears and press the power button on and off in the right sequence?

If so, you need to get a copy of page 41 and 42 of the AT section of Nissan's GQ workshop manual, it clearly explains how to test each of these components. No guesswork, just checking voltages at the TCU with a multimeter. It's a process of elimination.

I found this very tedious with our auto, but it was what led to fixing it.

on 26th March 2012 04:40 PM - Nothing comes up for an aftermarket sensor. Just found out its gonna be another 2 week's wait for the other temp sensor!

So in less than a week this should arrive?

[taslucas]

Yep, the new sensor should be here any day. I'll get that fitted and go from there.

I've had all the work done by an auto specialist.
First we fitted a reco TC.
No fix.
Then pulled the box completely apart to find it in really good condition. The guy said it looked like it had done less than 5000ks after a reco. He thoroughly checked every little part/wire/oil gallery.
While it was apart we fitted an aftermarket heavy duty valvebody.
(it was ment to come with a new temp sensor)
Fitted all back together.
Still no fix!
Found that the temp sensor hadn't been replaced. Replaced temp sensor with a second hand one.
Problem fixed!!!!...........for 6 weeks then came back.
I'm hoping that the second hand temp sensor failed (even tho it would be a coincidence) and that the new one (arriving soon) will fix the problem.
If not, then I'll check the TCU resistance.



tappn it

[ripper]

I'm hoping that the second hand temp sensor failed (even tho it would be a coincidence) and that the new one (arriving soon) will fix the problem.

That does sound like the most likely suspect, except that the error code doesn't match

If not, then I'll check the TCU resistance.

If it gets to this stage, I can probably help with explaining it more if necessary. For your code the tests start at the TCU with it still connected, for mine they started in the engine bay.

[taslucas]

Ok so I picked up the sensor....it was the wrong one.


Got them to get the right one...

Two more weeks go by.....

Picked up the correct sensor last week. Booked in to get it fitted (yes I'm lazy Todd! Lol).

Picked trol up this arvo.....

Yep......the new sensor hasn't changed a damn thing.....

Hmmmm what next?

Going to borrow a Mates TCU this weekend and try that. It's from a mav with a series 2 box? (has O.D button and HOLD button?) so would that be ok?

Wish me luck!

tappin it

[NissanGQ4.2]

Not sure if the TCU will work or not, I don't know if I personally would risk plugging in someone else's TCU unless it had the same part number on it.

I better go back to the start of this thread and have a long re-read

[ripper]

Yeah, I wouldn't be keen to put another TCU in unless it was an exact match.

If you have any thoughts of adding a manual toque converter set up, now may be the best time to do that. It'll let you isolate whether the problem is in the torque converter, or in the sensors.

I'm almost ready to post a thread with the whole story of my manual torque converter project, should be done very soon.

[NissanGQ4.2]

Should not be the TC as you have fitted a reconditioned one.

When you got the new valve body, did you also get new solenoids or did you use your old ones?

[ripper]

Should not be the TC as you have fitted a reconditioned one.

You're right, my bad.

When you got the new valve body, did you also get new solenoids or did you use your old ones?

It's not hard to test the circuit. Just undo the connector near the battery and measure the resistance between the correct terminal and earth.

I'm almost ready to post a thread with the whole story of my manual torque converter project, should be done very soon.

Done now My GQ manual torque converter lock up system (lotts-of-photos)

[taslucas]

Should not be the TC as you have fitted a reconditioned one.

When you got the new valve body, did you also get new solenoids or did you use your old ones?

I was told by wholesale autos that a failing lockup solenoid was super rare and that it would be all good, so I assume they didn't change it.

Everything is brand new except for the solenoid for the lockup TC. So I'm thinking it must be that.

It can only be the lockup solenoid, speed sensor, some damaged wiring, or a faulty tcu.
The vehicle behaves as it should for the first half hour or so if driving.
If I go straight onto a highway I can drive for more than an hour without the problem happening. Then if I stop for 10 mins or so, when I get back on the highway, as soon as I get to 90k/h it starts playing up! So what ever is broken will work for a while then start failing. I thought it would have to be temperature related as nothing else changes while driving.

tappin it

[ripper]

I thought it would have to be temperature related as nothing else changes while driving.

I'm not so sure. Getting up to operating temp only takes about 10 min. These electronic boxes really can be temperamental.
Have you got a new error code since the temp sensor went in, to narrow down which circuit is the problem?